UIPickerView: unrecognized selector sent to instance - only on ios 3.1.x

Question

I have a UIViewController that has a UIPickerView. The picker's datasource and delegate are my controller as you would expect.

My controller implements the UIPickerViewDelegate and UIPickerViewDataSource protocols and all the methods that are required: numberOfComponentsInPickerView, numberOfRowsInComponent, titleForRow and didSelectRow

It's all working well on ios 4 but crashes on 3.1 with a nice "unrecognized selector sent to instance" as soon as I call [picker reloadInputViews] (It doesn't even reach breakpoints in the delegate or datasource methods).

I can't see what's missing here (happy to post code is needed)

Many thanks for your help!

Answer 1

You should call [picker reloadAllComponents]. reloadInputViews is a method of UIResponder and only available since iOS 3.2. At least according to the documentation. Which you should read.